Influence of cytoplasmic-nuclear male sterility on agronomic performance of sorghum hybrids

Journal of SAT Agricultural Research 01/2006;
Source: DOAJ


days to 50% flowering, plant height, grain yield and 100- grain weight (g). Statistical analysis. Analysis of variance (ANOVA) was carried out as per SSPD. The general combining ability (gca) effects of the parents and the specific combining ability (sca) effects of the crosses were estimated as per Kempthorne (1957). The significance or otherwise of cytoplasmic differences in respect of gca effects of the A-lines and the mean performance and sca effects of the hybrids was determined by comparing with the least

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Available from: Sanjana P Reddy
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    • "The present findings are in congruence with those reported by Ramesh et al . ( 2006 ) in sorghum , Kumar and Sagar ( 2010 , 2009 ) in pearl millet and Gill et al . ( 2007 ) in cotton ( Table 2 ) . Four hybrids were superior over standard check for ethanol yield viz ,"
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    ABSTRACT: A B S T R A C T Fossil energy resources, the primary source of transport fuel in the world is depleting dramatically to meet the ever-increasing energy demands globally. However, climate change caused by green house gas emissions (GHG) from fossil fuels and energy security in the future are the two major concerns which drives us to search for alternative energy sources. Crop plants are one of the best sources of renewable energy which can be used as feedstock for biofuel production. Hence, the biofuel resources like sweet sorghum, other herbaceous grasses and fast growing forest trees are on their way to meet the energy requirements. Sweet sorghum, a C 4 graminaceous crop which has sugar rich stalks and which is a water use efficient crop has a very good potential as an alternative feed stock for ethanol production. Ethanol yield and its attributing traits in sweet sorghum was studied in 24 hybrids developed by crossing six A-lines viz, ICSA 631, ICSA 731, ICSA 324, ICSA 500, ICSA 38 and ICSA 84 with four R-lines viz, SEREDO, ICSV-700, ICSV 111 and E 36-1 in a line × tester mating design. The 10 parents and their 24 hybrids were grown separately in contiguous blocks in single row of 3m length with 0.15 m × 0.60 m spacing in simple lattice design with two replications at the experimental plots of Gandhi Krishi Vignana Kendra (GKVK), University of Agricultural Sciences, Bangalore. Mean performance and manifestation of significant in hybrid heterosis for mean cane height, mean cane weight, juice yield, juice extraction per cent and ethanol yield was observed.
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    ABSTRACT: Of the several male sterility cytoplasms available as an alternative to the widely exploited A1 (milo) cytoplasm in sorghum, A2 is more suitable for commercial exploitation. Diversification of genetic and cytoplasmic base of hybrids involving A2 cytoplasm necessitates mapping of fertility restorer (Rf) genes for use in marker-assisted restorer development. We mapped a major male fertility restoration locus on sorghum chromosome 4 tightly linked with SSR markers, SB2387 and SB2388. This new fertility locus, Rf6, was able to restore male fertility on both A1 and A2 cytoplasms. Analysis of the genomic region around the Rf6 locus identified six genes including a pentatricopeptide repeat (PPR) gene, Sobic.004G004100. With its similar restoration ability to Rf1, Rf2 and Rf5 loci in sorghum, it is most likely that the Rf6 is a member of the PPR gene family, and the PPR gene Sobic.004G004100 could be a candidate for fertility restoration on A1 and A2 cytoplasms. Copyright © 2015 Elsevier Ireland Ltd. All rights reserved.
    No preview · Article · Jun 2015 · Plant Science